Preliminary reports said the gates were down for a Loop-bound train and when the train passed, the vehicle went around the gates not expecting the Kimball-bound train, according to a CTA spokeswoman. The vehicle and the Kimball-bound Brown Line train collided, she said. Brown Line tracks run at ground level from the Rockwell to Kimball stops.

The injured officer was coming to the aid of her partner, who was chasing someone on foot, police said. They could not immediately say why police were after the person.

The injured officer was being treated in serious condition as of tonight.

Shuttle bus service was used through the area while the cleanup and investigation continued, but as of 7:50 p.m., service had resumed on the Brown Line, according to the CTA Website.

The officer was able to remove herself from the vehicle after the crash, said Police News Affairs Officer Veejay Zala.

A CTA employee was also taken to an area hospital in good condition, according to Fire Media information. Zala said the CTA employee was the engineer of the train and was taken to Swedish Covenant Hospital for observation.

An unmarked Chicago police squad car and a CTA Brown Line train collided on Kedzie Avenue just north of Wilson Avenue. The accident involved an Albany Park tactical unit police vehicle and a CTA Brown Line train.

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